5218 posix definition of NULL
correct unistd.h and iso/stddef_iso.h
update gate source affected

*** 427,437 ****
                                      mcnode);
                          }
                  }
          }
  
!         return (NULL);
  }
  
  int
  mc_node_create(topo_mod_t *mod, uint16_t chip_smbid, tnode_t *pnode,
      const char *name, nvlist_t *auth)
--- 427,437 ----
                                      mcnode);
                          }
                  }
          }
  
!         return (0);
  }
  
  int
  mc_node_create(topo_mod_t *mod, uint16_t chip_smbid, tnode_t *pnode,
      const char *name, nvlist_t *auth)
*** 449,472 ****
                  whinge(mod, NULL, "mc failed to snapshot %s\n",
                      strerror(errno));
  
                  free(buf);
                  (void) close(mc_fd);
!                 return (NULL);
          }
          (void) close(mc_fd);
          (void) nvlist_unpack(buf, mcs.mcs_size, &nvl, 0);
          topo_mod_free(mod, buf, mcs.mcs_size);
  
          if (nvlist_lookup_uint8(nvl, MCINTEL_NVLIST_VERSTR, &ver) != 0) {
                  whinge(mod, NULL, "mc nvlist is not versioned\n");
                  nvlist_free(nvl);
!                 return (NULL);
          } else if (ver != MCINTEL_NVLIST_VERS0) {
                  whinge(mod, NULL, "mc nvlist version mismatch\n");
                  nvlist_free(nvl);
!                 return (NULL);
          }
  
          rc = mc_nb_create(mod, chip_smbid, pnode, name, auth, nvl);
  
          nvlist_free(nvl);
--- 449,472 ----
                  whinge(mod, NULL, "mc failed to snapshot %s\n",
                      strerror(errno));
  
                  free(buf);
                  (void) close(mc_fd);
!                 return (0);
          }
          (void) close(mc_fd);
          (void) nvlist_unpack(buf, mcs.mcs_size, &nvl, 0);
          topo_mod_free(mod, buf, mcs.mcs_size);
  
          if (nvlist_lookup_uint8(nvl, MCINTEL_NVLIST_VERSTR, &ver) != 0) {
                  whinge(mod, NULL, "mc nvlist is not versioned\n");
                  nvlist_free(nvl);
!                 return (0);
          } else if (ver != MCINTEL_NVLIST_VERS0) {
                  whinge(mod, NULL, "mc nvlist version mismatch\n");
                  nvlist_free(nvl);
!                 return (0);
          }
  
          rc = mc_nb_create(mod, chip_smbid, pnode, name, auth, nvl);
  
          nvlist_free(nvl);